It works in most cases. This photo is also a HDR made of 3 photo's at different exposure combined and the cascade turned out fine, no over exposure in the water, and the detail in the shaded area's are good. If this would have been a single photo I would have had to expose for the water and the shaded area's would have had been much, much darker. One the other hand if I compromised for both the shaded and highlights the photo would have been a compromise. http://maverick.zenfolio.com/img/v5/p205354895-5.jpg